- A
Azure Firewall
Azure Firewall can inspect outbound traffic, log it via diagnostic settings, and use application rules to allow/deny based on FQDNs. It is fully managed and integrates with Azure Monitor for logging.
- B
Network Virtual Appliance (NVA) from Azure Marketplace
Why wrong: NVAs such as third-party firewalls can also perform FQDN filtering and inspection, but they require additional management, licensing, and high-availability configuration. Azure Firewall is the simpler, native solution.
- C
Azure Application Gateway with Web Application Firewall (WAF)
Why wrong: Application Gateway is a Layer 7 load balancer with WAF for inbound web traffic. It is not designed for outbound traffic inspection or general FQDN filtering.
- D
Azure Network Security Groups (NSGs)
Why wrong: NSGs control traffic at the subnet or NIC level using rules based on IP addresses, ports, and protocols. They cannot filter based on FQDNs and do not provide central logging for all outbound traffic.
Quick Answer
The answer is Azure Firewall. This managed, cloud-native service is the correct choice because it provides centralized outbound traffic inspection and logging for all internet-bound traffic from an Azure virtual network, and its application rules allow you to allow or deny traffic based on fully qualified domain names (FQDNs) using Layer 7 filtering. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your understanding of network security controls and the distinction between Azure Firewall and other services like Network Security Groups or Azure Front Door—a common trap is choosing a Layer 4 solution that cannot filter by domain name. Remember that Azure Firewall is the only native service that combines centralized logging with FQDN-based application rules for outbound traffic. A useful memory tip: think "FQDN = Firewall’s Domain Name control," linking the feature directly to the service name.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has an Azure virtual network with multiple subnets. They want to centrally inspect and log all outbound traffic to the internet. They also need to allow or deny traffic based on domain names (FQDNs). Which Azure resource should they deploy?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Firewall
Azure Firewall is a managed, cloud-native network security service that provides centralized outbound traffic inspection and logging. It supports application rules based on fully qualified domain names (FQDNs), enabling allow or deny decisions for outbound traffic to the internet using Layer 7 (application layer) filtering, which meets both requirements directly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Azure Firewall
Why this is correct
Azure Firewall can inspect outbound traffic, log it via diagnostic settings, and use application rules to allow/deny based on FQDNs. It is fully managed and integrates with Azure Monitor for logging.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Network Virtual Appliance (NVA) from Azure Marketplace
Why it's wrong here
NVAs such as third-party firewalls can also perform FQDN filtering and inspection, but they require additional management, licensing, and high-availability configuration. Azure Firewall is the simpler, native solution.
- ✗
Azure Application Gateway with Web Application Firewall (WAF)
Why it's wrong here
Application Gateway is a Layer 7 load balancer with WAF for inbound web traffic. It is not designed for outbound traffic inspection or general FQDN filtering.
- ✗
Azure Network Security Groups (NSGs)
Why it's wrong here
NSGs control traffic at the subnet or NIC level using rules based on IP addresses, ports, and protocols. They cannot filter based on FQDNs and do not provide central logging for all outbound traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Firewall with Network Security Groups, mistakenly thinking NSGs can filter by domain names because they associate 'network security' with all traffic control, but NSGs lack Layer 7 capabilities and cannot inspect or filter based on FQDNs.
Detailed technical explanation
How to think about this question
Azure Firewall uses a combination of network rules (Layer 3/4) and application rules (Layer 7) to inspect traffic; application rules leverage SNI (Server Name Indication) from TLS handshakes or the Host header in HTTP/HTTPS to match FQDNs, allowing granular control over outbound traffic. Under the hood, Azure Firewall integrates with Azure Monitor and Azure Firewall Manager for centralized logging and policy management, and it supports threat intelligence-based filtering to block traffic to known malicious domains. In a real-world scenario, an organization might use Azure Firewall to enforce a policy that allows only specific SaaS endpoints (e.g., *.office365.com) while blocking all other outbound internet access, which is impossible with NSGs alone.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Secure networking — study guide chapter
Learn the concepts, then practise the questions
- →
Secure networking practice questions
Targeted practice on this topic area only
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All AZ-500 questions
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Microsoft Azure Security Engineer Associate AZ-500 study guide
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AZ-500 practice test guide
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Firewall — Azure Firewall is a managed, cloud-native network security service that provides centralized outbound traffic inspection and logging. It supports application rules based on fully qualified domain names (FQDNs), enabling allow or deny decisions for outbound traffic to the internet using Layer 7 (application layer) filtering, which meets both requirements directly.
What should I do if I get this AZ-500 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This AZ-500 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-500 exam.
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